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-rw-r--r--src/basic/namespace-util.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/src/basic/namespace-util.h b/src/basic/namespace-util.h
new file mode 100644
index 0000000..be5b228
--- /dev/null
+++ b/src/basic/namespace-util.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <sys/types.h>
+
+typedef enum NamespaceType {
+ NAMESPACE_CGROUP,
+ NAMESPACE_IPC,
+ NAMESPACE_NET,
+ NAMESPACE_MOUNT,
+ NAMESPACE_PID,
+ NAMESPACE_USER,
+ NAMESPACE_UTS,
+ NAMESPACE_TIME,
+ _NAMESPACE_TYPE_MAX,
+ _NAMESPACE_TYPE_INVALID = -EINVAL,
+} NamespaceType;
+
+extern const struct namespace_info {
+ const char *proc_name;
+ const char *proc_path;
+ unsigned int clone_flag;
+} namespace_info[_NAMESPACE_TYPE_MAX + 1];
+
+int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *userns_fd, int *root_fd);
+int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd);
+
+int fd_is_ns(int fd, unsigned long nsflag);
+
+int detach_mount_namespace(void);
+
+static inline bool userns_shift_range_valid(uid_t shift, uid_t range) {
+ /* Checks that the specified userns range makes sense, i.e. contains at least one UID, and the end
+ * doesn't overflow uid_t. */
+
+ assert_cc((uid_t) -1 > 0); /* verify that uid_t is unsigned */
+
+ if (range <= 0)
+ return false;
+
+ if (shift > (uid_t) -1 - range)
+ return false;
+
+ return true;
+}
+
+int userns_acquire(const char *uid_map, const char *gid_map);
+int in_same_namespace(pid_t pid1, pid_t pid2, NamespaceType type);